Question

When you walk across a carpet during the winter you often get a shock when you touch a metal door knob. The reason is that you pick up electrons via friction between your feet and the carpet. If you pick up -97.37 microC of charge, how many electrons did you acquire ?

Answer 1

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The total charge can be written as

`Q=-97.37*10^(-6)C`

And the charge of an individual electron is

`q=-1.6*10^(-19)C`

Thus, the number of electrons is the total charge acquired, divided by the amount of charge on each individual electron. This gives us:

`n=(Q)/(q)=(-97.37*10^(-6))/(-1.6*10^(-19))=6.085625*10^(14)`

So, we have acquired 6.085625*10^14 electrons